An aircraft having a pair of wing mounted jet engines and an aft engine of the high-bypass turbofan type mounted in the vertical stabilizer of the tail section. The aft engine has a straight air inlet duct passing through vertical stabilizer spars attached directly to fuselage bulkheads. Each spar is a ring frame of a one-piece forging. A pylon beam extending aft from the base of the vertical stabilizer provides a top engine interface similar to that on the wing.
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